气相色谱法测定水中三氯乙醛时，为什么计算水中三氯乙醛含量时要考虑萃取率？

读短文，判断句子正(T)误(F)。

      I'm John. This is my family. There are four people in my family. What are they doing? I'm doing my

homework. My mother is washing clothes. My father is talking on the telephone. Where is my sister? Oh,

she's listening to the radio in her bedroom.

( ) 1. There are five people in John's family.

( ) 2. John is doing his homework.

( ) 3. His father is watching TV.

( ) 4. His mother is washing clothes.

( ) 5. John's sister isn't at home.

如网上银行落地业务专用凭证或记账凭证打印有误，经（）后方可补打凭证。

A、无需授权

B、三级主管授权

C、九级主管授权

D、客户授权

Crow considers the TV shows “a beautiful model of_______ I call high-tech learning. They can teach children about things in ways traditional education can’t.”

A．which

B．why

C．what

D．that

阅读以下说明和C函数，填充函数中的空缺。
[说明]
函数GetDateId(DATE date)的功能是计算并返回指定合法日期date是其所在年份的第几天。例如，date表示2008年1月25曰时，函数的返回值为25，date表示2008年3月3日时，函数返回值为63。
函数Kday_Date(int theyear,int k)的功能是计算并返回指定合法年份theyear(theyear≥1900)的第天(1≤k≤365)所对应的日期。例如，2008年的第60天是2008年2月29日，2009年的第60天是2009年3月1日。
函数isLeapYear(int y)的功能是判断y代表的年份是否为闰年，是则返回1，否则返回0。
DATE类型定义如下：
typedef struct
int year,month,day;
DATE;
[C函数1]
int GetDateId(DATE date)
Const int days_month[13]=(0,31,28,31,30,31,30,31,31,30,31,30,31);
int i,date_id=date.day;
for(i=0;i＜______;i++)
date_id+=days_month[i];
if(______＆＆isLeapYear(date.year))date_id++;
return date_id;

[C函数2]
______Kday_Date(int theyear,int k)

int i;
DATE date;
int days_month[13]=(0,31,28,31,30,31,30,31,31,30,31,30,31);
assert(k＞=1＆＆k＜=365＆＆theyear＞=1900); /*不满足断言时程序终止*/
date.year=______;
if(isLeapYear(date.year))days_month[2]++;
for(i=1;;)
k=k-davs_month[i++];
if(k＜=0)(date.day=k+______;date.month=i-1;break;

return date;

简述传染性非典型肺炎的治疗原则。